Question: When was the start time for Louisville and its twinned administrative body Mainz?
Paraphrase: Which was the start time for Louisville and it's twinned administrative body Mainz?
SPARQL (Wikidata): SELECT ?value WHERE { wd:Q43668 p:P190 ?s . ?s ps:P190 wd:Q1720 . ?s pq:P580 ?value}